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  <script>
    var closestDivisors = function (num) {
      for (let i = parseInt(Math.sqrt(num + 2)); i >= 1; i--) {//开根号一定要num+2,是否可缩小有点像数学性质

        if ((num + 1) % i == 0) {
          var k = (num + 1) / i
          return [i, k]
        }
        if ((num + 2) % i == 0) {
          var k = (num + 2) / i
          return [i, k]
        }
      }

    };
    console.log(closestDivisors(8))
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